2,4,5-Trichlorophenoxyacetic acid (2,4,5-T) decomposition in tropical soil and its cometabolism by bacteria in vitro

Rosenberg, Arthur; Alexander, Martin

doi:10.1021/jf60230a010

Cited by 24 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pretreatment of soil with 2,4,5-trichlorophenol had no effect on the fate of subsequently applied 14 C-2,4,5-T (Table 2). About one-third of the Initially applied 2,4,5-T was We are not aware of any enhanced degradation of 2,4,5-T, and the microorganisms found to metabolize 2,4,5-T do not use it as a carbon or energy source (Rosenberg and Alexander, 1980). It is therefore not surprising that trichlorophenol did not serve as a microbial substrate.…”

Section: Downloaded By [] At 15:29 03 February 2015mentioning

confidence: 97%

Degradation of pesticides in soil as influenced by the presence of hydrolysis metabolites

Somasundaram

Coats

Racke

1989

J. of Env. Sc. & Hlth., Part B

View full text Add to dashboard Cite

The degradation of 8 pesticides was evaluated in a soil pretreated with their respective hydrolysis metabolites. 2,4-Dichlorophenol, p-nitrophenol, and salicylic acid conditioned the soil for enhanced degradation of 2,4-dichlorophenoxyacetic acid (2,4-D), parathion, and isofenphos, respectively. Repeated application of carbofuran phenol, 2-isopropyl-4-methyl-6-hydroxypyrimidine, methyl phenyl sulfone, thiophenol, isopropyl salicylate, and 2,4,5-trichlorophenol had no effect on the rate of degradation of their parent pesticides. Prior exposure of soil to 3,5,6-trichloro-2-pyridinol resulted in increased persistence of its parent compound, chlorpyrifos. Results indicate that pesticide hydrolysis metabolites can effect the induction or inhibition of enhanced microbial degradation of some soil-applied pesticides. 457

show abstract

Section: Downloaded By [] At 15:29 03 February 2015mentioning

confidence: 97%

Degradation of pesticides in soil as influenced by the presence of hydrolysis metabolites

Somasundaram

Coats

Racke

1989

J. of Env. Sc. & Hlth., Part B

View full text Add to dashboard Cite

show abstract

“…A soil isolate of Pseudomonas fluorescens converted 2,4,5-T to 2,4,5trichlorophenol, which was not degraded further by the bacterium [167]. Several other bacteria were isolated that transformed 2,4,5-T to 2,4,5trichlorophenol and other metabolites, but none were able to use it as a source of carbon and energy [168]. In soil suspensions, however, 2,4,5-T was mineralized to CO2, with 2,4,5-trichlorophenol and 3,5-dichlorocatechol identified as metabolites [167].…”

Section: Aerobic Degradation Of Chlorophenoxyalkanoic Acidsmentioning

confidence: 99%

Microbial breakdown of halogenated aromatic pesticides and related compounds

Häggblom

1992

FEMS Microbiology Letters

363

132

View full text Add to dashboard Cite

Considerable progress has been made in the last few years in understanding the mechanisms of microbial degradation of halogenated aromatic compounds. Much is already known about the degradation mechanisms under aerobic conditions, and metabolism under anaerobiosis has lately received increasing attention. The removal of the halogen substituent is a key step in degradation of halogenated aromatics. This may occur as an initial step via reductive, hydrolytic or oxygenolytic mechanisms, or after cleavage of the aromatic ring at a later stage of metabolism. In addition to degradation, several biotransformation reactions, such as methylation and polymerization, may take place and produce more toxic or recalcitrant metabolites. Studies with pure bacterial and fungal cultures have given detailed information on the biodegradation pathways of several halogenated aromatic compounds. Several of the key enzymes have been purified or studied in cell extracts, and there is an increasing understanding of the organization and regulation of the genes involved in haloaromatic degradation. This review will focus on the biodegradation and biotransformation pathways that have been established for halogenated phenols, phenoxyalkanoic acids, benzoic acids, benzenes, anilines and structurally related halogenated aromatic pesticides. There is a growing interest in developing microbiological methods for clean‐up of soil and water contaminated with halogenated aromatic compounds.

show abstract

“…The development of these organisms depends on their metabolizing an energy source, so that the co-substrate 2,4-D can be co-metabolized (Bauer et al 1979; Rosenberg and Alexander 1980). Rosenberg and Alex-ander (1980) found that many bacteria are capable of co-metabolizing 2,4-D or both 2,4-D and 2,4,5-T in the presence of energy sources.…”

Section: Microbial Co-metabolismmentioning

confidence: 99%

“…It has been well established that bacterial enzymes can be induced by compounds that are not substrates of the enzymes they induce (Pardee 1962). Glucose was a growth substrate for microbial populations co-metabolizing DDT (Pfaender and Alexander 1973), chlorinated benzoates (Horvath 1973), including m-chlorobenzoate (Horvath et al 1975), monofluorobenzoates (Horvath and Flathman 1976), 2,4-D, and 2,4,5-T (Rosenberg and Alexander 1980). It thus appears that 2,4-D degradation in soil could be stimulated by carbohydrates such as glucose, provided as a continuous supply from decomposing plant components or root exudates (Alexander 1977), or an increase in nutrients and the presence of2,4-D molecules may provide for the rapid spread by bacterial conjugation of genetic factors or plasmids determining the degradation (Waid 1972).…”

Section: Soil Amendmentsmentioning

confidence: 99%